Braintree police responded to four overdoses in eight hours Sunday, while a Marshfield woman died from an apparent heroin overdose Wednesday morning

Two of the Braintree overdoses involved opiates, which continue to plague the area as police arm themselves with Narcan, a nasal spray that reverses the effects of opioid overdoses.

Help arrived too late for a 34-year-old Marshfield woman found dead early Wednesday morning after she apparently overdosed on heroin, Marshfield Police Chief Phillip Tavares said.

“Officers had a traffic stop going on, and while they were handling that a resident came out saying they believed a person had passed,” Tavares said. “Preliminary evidence suggests it was a heroin overdose.”

Braintree police say officers were sent to the Tiki Palace around 2 p.m. Sunday for a 23-year-old Weymouth man who had overdosed in a car in front of the restaurant. He was given Narcan and sent to South Shore Hospital.

Then around 8:30 p.m., police were sent to the 400 block of Washington Street for an 18-year-old who was reportedly banging his head on a building after overdosing on LSD. The teenager was restrained and taken to South Shore Hospital.

Less than an hour later, around 9:15 p.m., police were sent to a Kmart store for a report of a 33-year-old Boston man who had overdosed on heroin. Police gave the man Narcan to revive him and, after restraining him, brought him to South Shore Hospital.

The final call, which came in shortly after 9:30 p.m., was for a 24-year-old Braintree woman who had overdosed on Valium and alcohol. She was taken to Quincy Medical Center.

Tavares said the number of overdose incidents and deaths so far this year in Marshfield has been staggering. “From January 2014 forward, it’s higher than it’s ever been,” he said.

Tavares attributed the overdose epidemic to increased opiate use coupled with bad heroin, or heroin cut with other agents, like the drug fentanyl.

“People are taking something made in 50-gallon trash drums and injecting it in their veins. It’s shooting poison,” he said. “They’re rolling the dice with their lives.”